Silent grand pianos exist, though the ones I'm aware of also include the acoustic bits as an option, e.g., https://usa.yamaha.com/products/musical_instruments/

Silent grand pianos exist, though the ones I'm aware of also include the acoustic bits as an option, e.g., https://usa.yamaha.com/products/musical_instruments/pianos/silent_piano/sh/index.html https://usa.yamaha.com/products/musical_instruments/pianos/s... https://www.boesendorfer.com/en/pianos/silent-edition https://www.boesendorfer.com/en/pianos/silent-edition